I purchased this one some years ago from Neil Miller.
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Also here the name Magog is not mentioned on the label, so it is not proven if this is a Hindostan or Magog or from another quarry. Neil wrote about the stone:
This type of stone has been mentioned in a book dated 1892 by A. J. Bower called "How To Make Things," in which he states "...for the fine edge you must use the oilstone. There are several kinds of oilstone employed for setting edged tools; the best and the greatest favourite with our carpenters is the Charnley forest stone, which is found in Leicestershire. The Canada oilstone is also a good stone, and costs somewhat less than the Charnley stone..."
It is mentioned in another text by C. P. B. Shelley dated between 1827 and 1890 in which it is stated: "...Canada Oilstone. A very fine porous sandstone of a greyish white colour, which has been recently introduced. Being much less compact than any of the preceding stones, it is much more rapidly worn away. Its first cost is, however, rather less than that of Charnley Forest."
What is not clear is where the stone originated from, but there are some tantalising clues. In appearance the stone is exactly similar to the Hindostan stone, a rather slow but fine finisher composed mainly of novaculite and layered in characteristic strata. In the scant literature available it appears that there is a long narrow lake lying partly in Canada (it is between Vermont, USA and Quebec, Canada), called Lake Memphremagog. On an island in the lake is an outcrop of novaculite that was mined for hone stones. In 1817 a company started by a certain Roman Fyler in Vermont sold shaving brushes an boxes. One day somebody bought a hone from the island to Mr Tyler and he saw that it was ideal as a razor hone, and included them from then on in his shaving boxes - he also bought the quarry on the island. After some time the shaving brush and box industry declined and Mr Tyler just produced the oilstones - sold at that time as Magog Oil-Stone. It may well be that this same island quarry produced the Canada Oilstone! If not, it is probable that there are other novaculite deposits in the area.
Mr Tyler compared the Magog Oilstone to the best turkey stones and both the previous citations compare it to a charnley forest hone. From my few limited experiments on the hone (it was so like a Hindostan in the edge it produces that I did not do many experiments) I would say that the grit equivalence is somewhere between 8k - 12k. (note that this is highly subjective and the hone will probably perform at a higher grit rating if the bevel is well refined before use). The stone is not as porous as the above accounts lead one to think, but is very compact and takes on a sheen that is quite reflective - the filament of a light bulb can be seen in the reflection cast by the stone, so it is quite adamantine in nature. The edge achieved varies in proportion to the amount of preparation - as is the case with all these very hard stones - and the bevel must be fully formed and well refined before it meets this hone. With enough prior refinement a very good edge is achieved which is quite crisp in feeling. If there is even a hint of rounding the edge feels 'grabby' and unpleasant to shave with. It seems to work well with softer, vintage steels like late 1800s Sheffield steel, rather than very hard american and swedish steel - according to the few razors I have used it as a final finisher on. In my experience it is not 'fast-cutting' like it says on the label unless a thin slurry is worked up on it with a very fine diamond hone. Note that the stone comes without a slurry stone.
The appearance of the bevel is much like that left by a charnley forest hone - it is not mirror-like as might be expected, but shows quite a pronounced scratch pattern.
Some detailed pictures:
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